A detective and a militia captain are working together investigating a murder. When their job is done, the feelings do not let them say goodbye.

On the night of June 22, 1941, a fire breaks out on a German passenger ship. The Soviet tanker "Caspian" comes to its aid - and navigator Nikolai Borshch rescues a German girl, being severely injured in the process. Later, however, the Germans capture the "Caspian" and force it to go to Hamburg...

Alan York is a race horse jockey who sees his friend and chief rival jockey fall to his death during a steeplechase race. Alan knows it could not have been an accident. He pursues clues while meeting a lovely young lady and her fascinating uncle, until he finally discovers why his friend died... and why he is next to die.